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Chevron Products Company Page Q Pormer Chevron Service Station#9-5775,341 West Kettleman Lane,Lodi,Cahfomia July 15 2002 Maxunum Constituent Concentration (ppmv) Sampling March 20 through June 25,2002 Location TPHg Benzene Toluene Ethyl- Xylenes MtBE benzene INFL 10 <0 050 0 062 0 071 1 6 <0 10 EFFL <5 0 <0 050 0 066 <0 050 037 <0 10 Explanations ppmv=Parts per million by volume <Indicates the constituent was not present at or above the method reporting limit shown SVE operability exceeded 100% during the 2Q02 Table 5 and 5 1 present operational measurements and calculated mass removal rates for TPHg and benzene, and MtBE, respectively During the 2Q02, the SVE system removed approximately 5 7 pounds of TPHg and 0 1 pounds of benzene Since operation began, the SVE system has removed an estimated 4,103 6 pounds of TPHg, 85 5 pounds of benzene, and 443 8 pounds of MtBE Mass removal trends and influent soil vapor TPHg, benzene, and MtBE concentrations versus time are shown on Figures 8 and 9, respectively SVE system emission data is presented in Table 6 3.3 Estimated Mass of Hydrocarbons in Soil and Groundwater The hydrocarbon mass estimates presented below are an update of results presented within the Problem Assessment Report/Frnal Remediation Plan (PAR/FRP)Addendum, dated June 5, 2001 and sections 3 1 and 3 2 above Methodology for determining the mass of hydrocarbons adsorbed to soil and dissolved in groundwater can be found within the PAR/FRP Addendum 3 3 1 Estimated Mass of Petroleum Hydrocarbons Adsorbed in Soil The results presented below are based on the calculation presented within the PAR/FRP Addendum and cumulative 2Q02 SVE mass removal data To conservatively estimate analyte mass remaining, historical soil analytical data was used This information is summarized in the following table 11Chevron1957751Penodic MonitonnglQuarterly Progress Reports\200212nd Quarter-2002 Progress Report doc